From c3a53f2720c6baf7fbc214a54e062ed517b732c3 Mon Sep 17 00:00:00 2001 From: Reid Spencer Date: Mon, 26 Mar 2007 05:32:16 +0000 Subject: [PATCH] Test case for PR1271 involving construction of a bad mask to replace a shift instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35349 91177308-0d34-0410-b5e6-96231b3b80d8 --- .../InstCombine/2007-03-25-BadShiftMask.ll | 28 +++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll diff --git a/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll b/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll new file mode 100644 index 00000000000..3a706a5686a --- /dev/null +++ b/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll @@ -0,0 +1,28 @@ +; PR1271 +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 'br i1 %1' +%struct..0anon = type { i32, i32 } +%struct..1anon = type { double } + +define i32 @main() { +entry: + %u = alloca %struct..1anon, align 8 ; <%struct..1anon*> [#uses=4] + %tmp1 = getelementptr %struct..1anon* %u, i32 0, i32 0 ; [#uses=1] + store double 0x7FF0000000000000, double* %tmp1 + %tmp3 = getelementptr %struct..1anon* %u, i32 0, i32 0 ; [#uses=1] + %tmp34 = bitcast double* %tmp3 to %struct..0anon* ; <%struct..0anon*> [#uses=1] + %tmp5 = getelementptr %struct..0anon* %tmp34, i32 0, i32 1 ; [#uses=1] + %tmp6 = load i32* %tmp5 ; [#uses=1] + %tmp7 = shl i32 %tmp6, 1 ; [#uses=1] + %tmp8 = lshr i32 %tmp7, 21 ; [#uses=1] + %tmp89 = trunc i32 %tmp8 to i16 ; [#uses=1] + icmp ne i16 %tmp89, 2047 ; :0 [#uses=1] + zext i1 %0 to i8 ; :1 [#uses=1] + icmp ne i8 %1, 0 ; :2 [#uses=1] + br i1 %2, label %cond_true, label %cond_false + +cond_true: ; preds = %entry + ret i32 0 + +cond_false: ; preds = %entry + ret i32 1 +} -- 2.34.1